package com.dstz.base.db.table.impl.dm;

import com.dstz.base.db.api.table.model.Column;
import com.dstz.base.db.api.table.model.Table;
import com.dstz.base.db.table.BaseTableOperator;
import org.apache.commons.lang3.StringUtils;
import org.springframework.jdbc.core.RowMapper;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 达梦 数据库表操作的接口实现。
 *
 * <pre>
 * </pre>
 */
public class DmTableOperator extends BaseTableOperator {


    /*
     * 创建表 (non-Javadoc)
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#createTable(com.dstz.base
     * .api.table.model.Table)
     */
    @Override
    public void createTable(Table table) throws SQLException {
        List<Column> columnList = table.getColumnList();
        // 建表语句
        StringBuilder sb = new StringBuilder();
        // 主键字段
        String pkColumn = null;

        // 例注释
        List<String> columnCommentList = new ArrayList<String>();
        // 建表开始
        sb.append("CREATE TABLE " + table.getTableName() + " (\n");
        for (int i = 0; i < columnList.size(); i++) {
            // 建字段
            Column column = columnList.get(i);
            sb.append("    ").append(column.getFieldName()).append("    ");
            sb.append(getColumnType(column.getColumnType(),
                    column.getCharLen(), column.getIntLen(),
                    column.getDecimalLen()));
            sb.append(" ");

            // 主键
            if (column.getIsPk()) {
                if (pkColumn == null) {
                    pkColumn = column.getFieldName();
                } else {
                    pkColumn += "," + column.getFieldName();
                }
            }
            // 添加默认值
            if (StringUtils.isNotEmpty(column.getDefaultValue())) {
                if (Column.COLUMN_TYPE_NUMBER.equals(column.getColumnType()) || Column.COLUMN_TYPE_INT.equals(column.getColumnType())) {
                    sb.append(" DEFAULT " + column.getDefaultValue());
                } else {
                    sb.append(" DEFAULT '" + column.getDefaultValue() + "' ");
                }
            }

            // 非空
            // if (!cm.getIsNull()) {
            // sb.append(" NOT NULL ");
            // }

            // 字段注释
            if (column.getComment() != null && column.getComment().length() > 0) {
                // createTableSql.append(" COMMENT '" + cm.getComment() + "'");
                String comment = "COMMENT ON COLUMN " + table.getTableName() + "."
                        + column.getFieldName() + " IS '" + column.getComment()
                        + "'\n";
                columnCommentList.add(comment);
            }
            sb.append(",\n");
        }
        // 创建主键
        if (pkColumn != null) {
            sb.append("    CONSTRAINT PK_").append(table.getTableName())
                    .append(" PRIMARY KEY (").append(pkColumn).append(")");
        }

        // 建表结束
        sb.append("\n)");
        // 表注释
        jdbcTemplate.execute(sb.toString());
        if (table.getComment() != null && table.getComment().length() > 0) {
            jdbcTemplate.execute("COMMENT ON TABLE " + table.getTableName()
                    + " IS '" + table.getComment() + "'\n");
        }
        for (String columnComment : columnCommentList) {
            jdbcTemplate.execute(columnComment);
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#getColumnType(com.dstz.base
     * .api.table.model.Column)
     */
    @Override
    public String getColumnType(Column column) {
        return getColumnType(column.getColumnType(), column.getCharLen(),
                column.getIntLen(), column.getDecimalLen());
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#getColumnType(java.lang.String
     * , int, int, int)
     */
    @Override
    public String getColumnType(String columnType, int charLen, int intLen,
                                int decimalLen) {
        if (Column.COLUMN_TYPE_VARCHAR.equals(columnType)) {
            return "VARCHAR2(" + charLen + ')';
        } else if (Column.COLUMN_TYPE_NUMBER.equals(columnType)) {
            return "NUMBER(" + (intLen + decimalLen) + "," + decimalLen + ")";
        } else if (Column.COLUMN_TYPE_DATE.equals(columnType)) {
            return "DATE";
        } else if (Column.COLUMN_TYPE_INT.equals(columnType)) {
            return "NUMBER(" + intLen + ")";
        } else if (Column.COLUMN_TYPE_CLOB.equals(columnType)) {
            return "CLOB";
        } else {
            return "VARCHAR2(200)";
        }
    }

    /*
     *
     * 删除表
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#dropTable(java.lang.String)
     */
    @Override
    public void dropTable(String tableName) throws SQLException {
        String selSql = "select count(*) amount from user_objects where object_name = upper('"
                + tableName + "')";
        int rtn = jdbcTemplate.queryForObject(selSql, Integer.class);
        if (rtn <= 0)
            return;
        String sql = "drop table " + tableName;
        jdbcTemplate.execute(sql);

    }

    /*
     * 修改表的注释
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#updateTableComment(java.lang
     * .String, java.lang.String)
     */
    @Override
    public void updateTableComment(String tableName, String comment)
            throws SQLException {
        StringBuilder sb = new StringBuilder();
        sb.append("COMMENT ON TABLE ").append(tableName).append(" IS '")
                .append(comment).append("'\n");
        jdbcTemplate.execute(sb.toString());
    }

    /*
     * 添加列
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#addColumn(java.lang.String,
     * com.dstz.base.api.table.model.Column)
     */
    @Override
    public void addColumn(String tableName, Column model) throws SQLException {
        StringBuilder sb = new StringBuilder();
        sb.append("ALTER TABLE ").append(tableName);
        sb.append(" ADD ");
        sb.append(model.getFieldName()).append(" ");
        sb.append(getColumnType(model.getColumnType(), model.getCharLen(),
                model.getIntLen(), model.getDecimalLen()));

        // 添加默认值
        if (StringUtils.isNotEmpty(model.getDefaultValue())) {
            sb.append(" DEFAULT " + model.getDefaultValue());
        }
        // 添加是否为空
        // if (!model.getIsNull()) {
        // sb.append(" NOT NULL ");
        // }
        sb.append("\n");
        jdbcTemplate.execute(sb.toString());
        if (model.getComment() != null && model.getComment().length() > 0) {
            jdbcTemplate.execute("COMMENT ON COLUMN " + tableName + "."
                    + model.getFieldName() + " IS '" + model.getComment() + "'");
        }

    }

    /*
     * 修改列
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#updateColumn(java.lang.String,
     * java.lang.String, com.dstz.base.api.table.model.Column)
     */
    @Override
    public void updateColumn(String tableName, String columnName, Column column)
            throws SQLException {
        // 修改列名
        if (!columnName.equals(column.getFieldName())) {
            StringBuilder modifyName = new StringBuilder("ALTER TABLE ")
                    .append(tableName);
            modifyName.append(" RENAME COLUMN ").append(columnName)
                    .append(" TO ").append(column.getFieldName());
            jdbcTemplate.execute(modifyName.toString());
        }

        // 修改列的大小,此处不修改列的类型,若修改列的类型则在前面部分已抛出异常
        StringBuilder sb = new StringBuilder();
        // alter table test01 modify(test_01 NUMBER(1));
        sb.append("ALTER TABLE ").append(tableName);
        sb.append(" MODIFY(" + column.getFieldName()).append(" ");
        sb.append(getColumnType(column.getColumnType(), column.getCharLen(),
                column.getIntLen(), column.getDecimalLen()));
        if (!column.getIsNull()) {
            sb.append(" NOT NULL ");
        }
        sb.append(")");

        jdbcTemplate.execute(sb.toString());

        // 修改注释
        if (column.getComment() != null && column.getComment().length() > 0) {
            jdbcTemplate.execute("COMMENT ON COLUMN " + tableName + "."
                    + column.getFieldName() + " IS'" + column.getComment() + "'");
        }
    }

    /*
     *
     * 添加外键。
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#addForeignKey(java.lang.String
     * , java.lang.String, java.lang.String, java.lang.String)
     */
    @Override
    public void addForeignKey(String pkTableName, String fkTableName,
                              String pkField, String fkField) {
        String shortTableName = fkTableName.replaceFirst("(?im)W_", "");
        String sql = " ALTER TABLE " + fkTableName + " ADD CONSTRAINT fk_"
                + shortTableName + " FOREIGN KEY (" + fkField + ") REFERENCES "
                + pkTableName + " (" + pkField + ") ON DELETE CASCADE";
        jdbcTemplate.execute(sql);
    }

    /*
     * 刪除外鍵
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#dropForeignKey(java.lang.String
     * , java.lang.String)
     */
    @Override
    public void dropForeignKey(String tableName, String keyName) {
        String sql = "ALTER   TABLE   " + tableName + "   DROP   CONSTRAINT  "
                + keyName;
        jdbcTemplate.execute(sql);
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#getPKColumns(java.lang.String)
     */
    @Override
    public List<String> getPKColumns(String tableName) throws SQLException {
        String sql = "SELECT cols.column_name"
                + " FROM USER_CONSTRAINTS CONS, USER_CONS_COLUMNS COLS"
                + " WHERE UPPER(cols.table_name) = UPPER('" + tableName + "')"
                + " AND cons.constraint_type = 'P'"
                + " AND cons.constraint_name = cols.constraint_name"
                + " AND CONS.OWNER = COLS.OWNER";
        List<String> columns = jdbcTemplate.query(sql, new RowMapper<String>() {
            @Override
            public String mapRow(ResultSet rs, int rowNum) throws SQLException {
                return rs.getString(1);
            }
        });
        return columns;
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#getPKColumns(java.util.List)
     */
    @Override
    public Map<String, List<String>> getPKColumns(List<String> tableNames)
            throws SQLException {
        StringBuilder sb = new StringBuilder();
        for (String name : tableNames) {
            sb.append("'");
            sb.append(name);
            sb.append("',");
        }
        sb.deleteCharAt(sb.length() - 1);

        String sql = "SELECT cols.table_name,cols.column_name"
                + " FROM USER_CONSTRAINTS CONS, USER_CONS_COLUMNS COLS"
                + " WHERE UPPER(cols.table_name) in ("
                + sb.toString().toUpperCase() + ")"
                + " AND cons.constraint_type = 'P'"
                + " AND cons.constraint_name = cols.constraint_name"
                + " AND CONS.OWNER = COLS.OWNER";

        Map<String, List<String>> columnsMap = new HashMap<String, List<String>>();

        List<Map<String, String>> maps = jdbcTemplate.query(sql,
                new RowMapper<Map<String, String>>() {
                    @Override
                    public Map<String, String> mapRow(ResultSet rs, int rowNum)
                            throws SQLException {
                        String table = rs.getString(1);
                        String column = rs.getString(2);
                        Map<String, String> map = new HashMap<String, String>();
                        map.put("name", table);
                        map.put("column", column);
                        return map;
                    }
                });

        for (Map<String, String> map : maps) {
            if (columnsMap.containsKey(map.get("name"))) {
                columnsMap.get(map.get("name")).add(map.get("column"));
            } else {
                List<String> cols = new ArrayList<String>();
                cols.add(map.get("column"));
                columnsMap.put(map.get("name"), cols);
            }
        }

        return columnsMap;
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * com.dstz.base.db.table.BaseTableOperator#isTableExist(java.lang.String)
     */
    @Override
    public boolean isTableExist(String tableName) {
        StringBuilder sql = new StringBuilder();
        sql.append("select COUNT(1) from user_tables t where t.TABLE_NAME='")
                .append(tableName.toUpperCase()).append("'");
        return jdbcTemplate.queryForObject(sql.toString(), Integer.class) > 0 ? true
                : false;
    }

    @Override
    public boolean isExsitPartition(String tableName, String partition) {
        return false;
    }

    @Override
    public void createPartition(String tableName, String partition) {

    }

    @Override
    public boolean supportPartition(String tableName) {
        return false;
    }

}
